As shown by graph, no MP enhanced capital (5,4)

I believe the answer is:

phnom penh

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'as' is the definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.

'shown by graph no mp enhanced capital' is the wordplay.
'shown by' indicates a hidden word.
'PHNOM PENH' is hidden within 'graph no mp enhanced capital'.

Can you help me to learn more?

(Other definitions for phnom penh that I've seen before include "Cambodian capital" , "Capital of Cambodia" .)

I've seen this clue in The Independent.

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